diff --git a/client/displayservers/X11/x11.c b/client/displayservers/X11/x11.c
index 7a553b1f..d8100afb 100644
--- a/client/displayservers/X11/x11.c
+++ b/client/displayservers/X11/x11.c
@@ -232,7 +232,7 @@ static bool x11Init(const LG_DSInitParams params)
     x11.display,
     x11.window,
     x11.aNetWMWindowType,
-    XA_CARDINAL,
+    XA_ATOM,
     32,
     PropModeReplace,
     (unsigned char *)&x11.aNetWMWindowTypeNormal,
@@ -245,7 +245,7 @@ static bool x11Init(const LG_DSInitParams params)
       x11.display,
       x11.window,
       x11.aNetWMState,
-      XA_CARDINAL,
+      XA_ATOM,
       32,
       PropModeReplace,
       (unsigned char *)&x11.aNetWMStateFullscreen,